<form method="get" id="searchform" action="<?php bloginfo('url'); ?>/">
<div><input type="text" value="输入搜索" onfocus="this.value=''" onfocus="this.value='输入搜索';this.style.color='gray';" name="s" id="s" />
<input type="submit" id="go" value="" />
</div>
</form>